/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package servlets;

import java.io.IOException;
import java.io.PrintWriter;
import Entities.*;
import helpers.Debug;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.NamedQuery;
import javax.persistence.TypedQuery;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import rhserver.MainController;

/**
 *
 * @author Bari
 */
public class ResourceCategoryServlet extends HttpServlet {
   
    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
           
            EntityManager em = MainController.getInstance().getEntityManager();
          try {
             String  id= request.getParameter("id");
             if (id!=null)
               {
                   Debug.logMessage("delete category", "id: "+id);
                   long categoryId=Long.parseLong(id);
                   TypedQuery<Resourcecategory> query = em.createNamedQuery("Resourcecategory.findById", Resourcecategory.class);
                    query.setParameter("id", categoryId);
                    List<Resourcecategory> categories = query.getResultList();
                    if (categories.size()>0)
                    {
                        em.getTransaction().begin();
                        em.remove(categories.get(0));
                        em.getTransaction().commit();
                    }        
               }
              
            String name = request.getParameter("name");
            if (name != null) {//add new ResourceCategory
                Resourcecategory category=new Resourcecategory();
                category.setName(name);
                em.getTransaction().begin();
                em.persist(category);
                em.getTransaction().commit();
            }
            
               TypedQuery<Resourcecategory> query = em.createNamedQuery("Resourcecategory.findAll", Resourcecategory.class);
                List<Resourcecategory> categories = query.getResultList();
                request.setAttribute("categories", categories);
                request.getRequestDispatcher("/listcategories.jsp")
                .forward(request, response);
 
        } finally {
            // Close the database connection:
            if (em.getTransaction().isActive())
                em.getTransaction().rollback();
            em.close();
        }
 
            
    } 

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    } 

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}
